Furnace



L. V. REESE March 10, 1931.

FURNACE Original Filed July 13, .1927

INVENTOR.

BY 7/ i M/ A TTORNEYS.

Patented. Mar. 10, 1931 UNITED sra rss 'LPATENT orrlca 1EHUEZVfR1tESE, or cmcnmn'rr, onro, assrenon r Earn can monfwoaxs, or

ERIE, PENNSYLVANIA, A CORPORATION OI PENNSYLVANIA FURNACE Application filed July 18, 1927, Serial No. 208,495. Renewed January 22, 1930.

' fuel such aspowdered coal, or atomized oil..

The present invention is designed to improve the construction and operation of such ignition extensions. Features and details of the invention will appear from the specification and claims,

A preferable embodiment of the mvention is illustrated in the accompanying drawmgs as follows N Fig. 1 shows a central sect1on of a portion of the furnace with the ignition chamber, or I extension thereon.

Fig. 2 a section on the line 22 in Flg. 1.

Fig. 3 an enlarged section of a portion of the wall showing the means of regulating the air supply.

Fig. 1 a section on the line 4-4 n F1 1.

Fig. 5 an enlarged view of a port1on o the frame of the extension.

1 marks the furnace having the front wall 2. A fuel delivery opening 8 extends through the wall and the furnace extension or ignition chamber is arranged in front of the opening 3. The extension is provided with a refractory lining 4 which is made up of bricks formed in segments and this is supported by a frame comprising 1 beams 5 extending fore and aft outside of the refractory lining, the joints of the refractory lining being prefer: ably radially in line with the bars as clearly shown in Fig. 2. An outer shell 6 is arranged around the bars 5 and secured thereto by means of bolts 7. Air passages 8 are formed between the shell 6 and the refractory lining a and these are separated by means of the beams 5. The passages are closed at the front end of the extension by a flange 9 formed on the shell 6. a

The shell has a series of openings 10 at the rear end of the extension leading into passages 8. Bricks 11 are arranged around the front end of the extension and these have openings 12 leading from the passages 8. Preferably the passages 12 extend at an angle to radial lines, or are more or less tangentlal. A ring 13 is rotatively mounted on the shell 6 over the openings 10. and it is provided with openings 14 which are adapted to be brought into and out of register with the openings 10 so as to regulate the inlet capacity of these openings to the passages 8. A handle 15 is provided for operating the regulating ring.

Fuel is delivered through the front wall of the extension by ipes 16 which, as shown, are adapted to deliver comminuted fuel with some air. The pipes lead from a suppl pipe 17 and this in turn leads from an or inary pulverizer (not shown).

In the operation of the device, it will be noted that air, which would ordinarily be secondary air, is drawn in through the openings 14 and 10 and traverses the passages 8 along the refractory lining, thus cooling this lining and at the same time preheating the air. The

air is then delivered into the furnace through thefront end of the extension. By arranging the frame with the bars fore and aft a passage of the air is obtained throughout the circumference of the casing so that equal cooling of the refractories is assured. This arrangement of the bars also simplifies the construction in that ordinary straight bars may .be used in forming the frame.

What I claim as new is 1. In an apparatus of the class described the combination of a furnace chamber; an ignition chamber. having an annular wall and with an axially extending inlet and discharge, the discharge leading to. the furnace chamber; means for delivering fuel axially into the inlet end of the ignition chamber; and a shell surrounding the ignition chamber and spaced therefrom, said shell having an air inlet opening remote from the inletenCL of the ignition chamber, and the annular wall of the chamber having air openings therethrough from the space to the ignition chamber at its inlet end, the space between the shell and wall permitting a longitudinal fiow of air from the air inlet to the openings through the wall.

- 2. In an apparatus of the class described the combination of a furnace chamber; an ignition chamber having an annular wall and with an axially extending inlet and discharge, the discharge leading to the furnace cha nber; means for delivering fuel axially into the inlet end of the ignition chamber; and a shell surrounding the ignition chamber and spaced therefrom, said shell having an air inlet opening remote from the inlet endof the ignition chamber, and the annular Wall of the chamber having tangentially directedair openings therethrough from the space to the ignition chamber at its inlet end, the space between the shell and wall permitting a longitudinal flow of air from the air inlet to the o enings through the wall.

3. 11 an apparatus of the class described the combination of a furnace chamber; an ignition chamber having an annular wall and with an axially extending inlet and discharge, the discharge leading to the furnace chamber; means for delivering fuel axially into the inlet end of the ignition chamber; a shell surrounding the ignition chamber and spaced therefrom, said shell having an air inlet opening remote from the inlet end of the ignition chamber, and the annular wall of the chamber having air openings therethrough from the space to the ignition chamher at its inlet end,-the space between the shell and wall permitting a longitudinal flow of air from the air inlet to the openings through the wall, and means for adjusting the area of the air opening to the shell.

4. In a furnace, the combination of a furnace chamber; a stationary ignition extension on i the chamber comprising a metal frame of bars extending fore and aft of the extension; a refractory lining within the frame; a casing around the frame forming air passa' es between the casing and the refractory hning, said passages being separated by the bars and each passage having an air receiving inlet and an outlet discharging into the extension, the inlet and discharge being remote from each other and the'passage conveying the air lengthwise of the extension from the inlet to the discharge.

5. vIn a furnace, the combination of a furnace chamber; an ignition extension on the chamber comprising a metal frame of bars extending fore and aft of theextension; a refractory lining within the frame; a casing around the frame forming air passages between the casing and refractory lining, said passages being separated by the bars, and each passage having an inlet at one end and a discharge to the extension at the opposite end and remote from the inlet; and means delivering fuel to the extension.

6. In a furnace, the combination of a furnace chamber; an ignition extension on the chamber comprising a metal frame of bars extending fore and aft of the extension; a refractory lining within the frame; a casing around the frame forming air passages between the casing and refractor I lining, said passages being separated by t e bars, and each passage having an inlet at-the rear end and discharging to 'the furnace extension at its front end and remote from the inlet; and means delivering fuel to the extension.

7. In a furnace, the combination of a furnace chamber; an ignition extension on the chamber comprising a metal frame of bars extending fore and aft of the extension; a refractory lining within the frame; a casing around the frame forming air passages between the casing and refractory lining, said passages being separated by the bars, inlets for said passages being formed through the casing, said passages conveying air axially along the extension and discharging to the furnace extension remote from the inlets; a valve ring rotatably mounted on the casing and adapted to adjust said inlet passages; and means delivering fuel to the extension.

8. In a furnace, the combination of a furnace chamber; an ignition extension on the chamber comprising a metal frame of bars extending fore and aft of the extension; a

refractory lining made up of segmental re- I fractories having their joints radially in line with the bars; a casing around the frame my hand.

LEMUEL REESE. 

